CORVALLIS – - Oregon State center Isaac Seumalo, who missed all of fall camp with a foot injury, won’t return before the third game Sept. 20 against San Diego State.

Seuumlo suffered a broken left foot in the Beavers’ Hawaii Bowl victory against Boise State on Dec. 24, had surgery in January, and a subsequent procedure in April because his foot did not heal properly. He had a boot removed from foot two weeks ago.

“Isaac won’t enter in till after our bye week, some time after that, and I don’t know how soon,” OSU coach Mike Riley said during this week’s Pac-12 coaches’ teleconference, “but that’s three weeks away.”

A junior from Corvallis, Seumalo was a second-team all-Pac-12 selection last season and was voted as a team co-captain for the 2014 season.

With Seumalo out, sophomore tackle Sean Harlow will be the only returning starter on the offensive line heading into Saturday’s season opener against Portland State at Reser Stadium. He’ll be joined in the starting lineup by junior center Josh Mitchell, junior tackle Gavin Andrews, and sophomore guards Grant Bays and Garrett Weinreich.

“We’ve gotten about as healthy as we’re gonna be at this point so that’s a good thing,” Riley said of the offensive line. “We’ve had some continuity, guys playing together for a bit.”